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| I can't seem to comprehend Multicast addresses for instance 0100.5Exx.xxxx does the address reside in 0100.5E or xx.xxxx and how does it work. | |
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| Is this in the CCNA? This seems more like what you need to know for BCMSN in the CCNP track.
Multicasting IP addresses range from 224.0.0.0 to 239.255.255.255.
Basically any multicast is transmitted with a mac address commencing 0100.5e.xx.xxxx, where xxxxxx refers to the lower 23 bits of the ip address (note the 24th bit of the mac address is always zero).
For instance 224.10.8.5 maps (I hope you know hex) to 01-00-5E-0A-08-05. Note that I mentioned earlier about the 24th bit is always zero so 224.138.8.5 would also have the same mac address.
It is a big subject and I can't recall it being on CCNA, I guess you may need to be able to recognise that 01-00-58 refers to multicasting.
I hope this helps - but I wouldn't worry unduly over this until you get to CCNP, and then you can lose sleep!!
All the best. | |
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| I was just wanted to know Mat it was bugging me. Thanks for your explination. | |
| Mat P 2001-09-21, 12:32 am |
| quote:
Originally posted by Mat P
It is a big subject and I can't recall it being on CCNA, I guess you may need to be able to recognise that 01-00-58 refers to multicasting.
Apologies - 01-00-5E refers to multicasting not 58!!! | |
| strikeattack 2001-09-21, 1:44 pm |
| JFS, I have taken both the CCNA and BCMSN exam. You won't be asked this question on the CCNA exam, but you will be asked this question on the BCMSN exam. I can tell you that I hade more than 3 questions relating to the 01:00:5e multicast MAC-address. |
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